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tdlib-fork/tdutils/td/utils/port/Fd.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/port/config.h"
#include "td/utils/common.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#if TD_PORT_WINDOWS
#include "td/utils/port/IPAddress.h"
#include <memory>
#endif
#if TD_PORT_POSIX
#include <errno.h>
#include <atomic>
#endif
namespace td {
class ObserverBase;
#if TD_PORT_WINDOWS
namespace detail {
class EventFdWindows;
} // namespace detail
#endif
class Fd {
public:
// TODO: Close may be not enough
// Sometimes descriptor is half-closed.
enum Flag : int32 {
Write = 0x001,
Read = 0x002,
Close = 0x004,
Error = 0x008,
All = Write | Read | Close | Error,
None = 0
};
using Flags = int32;
enum class Mode { Reference, Owner };
Fd();
Fd(const Fd &) = delete;
Fd &operator=(const Fd &) = delete;
Fd(Fd &&other);
Fd &operator=(Fd &&other);
~Fd();
#if TD_PORT_POSIX
Fd(int fd, Mode mode);
#endif
#if TD_PORT_WINDOWS
static Fd create_file_fd(HANDLE handle);
static Fd create_socket_fd(SOCKET sock);
static Fd create_server_socket_fd(SOCKET sock, int socket_family);
static Fd create_event_fd();
#endif
Fd clone() const;
static Fd &Stderr();
static Fd &Stdout();
static Fd &Stdin();
static Status duplicate(const Fd &from, Fd &to);
bool empty() const;
const Fd &get_fd() const;
Fd &get_fd();
void set_observer(ObserverBase *observer);
ObserverBase *get_observer() const;
void close();
void update_flags(Flags flags);
Flags get_flags() const;
bool has_pending_error() const;
Status get_pending_error() TD_WARN_UNUSED_RESULT;
Result<size_t> write(Slice slice) TD_WARN_UNUSED_RESULT;
Result<size_t> read(MutableSlice slice) TD_WARN_UNUSED_RESULT;
Status set_is_blocking(bool is_blocking);
#if TD_PORT_POSIX
void update_flags_notify(Flags flags);
void clear_flags(Flags flags);
Result<size_t> write_unsafe(Slice slice) TD_WARN_UNUSED_RESULT;
int get_native_fd() const;
int move_as_native_fd();
#endif
#if TD_PORT_WINDOWS
Result<Fd> accept() TD_WARN_UNUSED_RESULT;
void connect(const IPAddress &addr);
uint64 get_key() const;
HANDLE get_read_event();
HANDLE get_write_event();
void on_read_event();
void on_write_event();
SOCKET get_native_socket() const;
HANDLE get_io_handle() const;
#endif
private:
Mode mode_ = Mode::Owner;
#if TD_PORT_POSIX
struct Info {
std::atomic<int> refcnt;
int32 flags;
ObserverBase *observer;
};
struct InfoSet {
InfoSet();
Info &get_info(int32 id);
private:
static constexpr int MAX_FD = 1 << 18;
Info fd_array_[MAX_FD];
};
static InfoSet fd_info_set_;
static Fd stderr_;
static Fd stdout_;
static Fd stdin_;
void update_flags_inner(int32 new_flags, bool notify_flag);
Info *get_info();
const Info *get_info() const;
void clear_info();
void close_ref();
void close_own();
int fd_ = -1;
#endif
#if TD_PORT_WINDOWS
class FdImpl;
enum class Type { Empty, EventFd, FileFd, StdinFileFd, SocketFd, ServerSocketFd };
Fd(Type type, Mode mode, HANDLE handle);
Fd(Type type, Mode mode, SOCKET sock, int socket_family);
explicit Fd(std::shared_ptr<FdImpl> impl);
friend class detail::EventFdWindows; // for release and acquire
void acquire();
void release();
std::shared_ptr<FdImpl> impl_;
#endif
};
#if TD_PORT_POSIX
template <class F>
auto skip_eintr(F &&f) {
decltype(f()) res;
static_assert(std::is_integral<decltype(res)>::value, "integral type expected");
do {
errno = 0; // just in case
res = f();
} while (res < 0 && errno == EINTR);
return res;
}
template <class F>
auto skip_eintr_cstr(F &&f) {
char *res;
do {
errno = 0; // just in case
res = f();
} while (res == nullptr && errno == EINTR);
return res;
}
#endif
template <class FdT>
bool can_read(const FdT &fd) {
return (fd.get_flags() & Fd::Read) != 0;
}
template <class FdT>
bool can_write(const FdT &fd) {
return (fd.get_flags() & Fd::Write) != 0;
}
template <class FdT>
bool can_close(const FdT &fd) {
return (fd.get_flags() & Fd::Close) != 0;
}
namespace detail {
#if TD_PORT_POSIX
Status set_native_socket_is_blocking(int fd, bool is_blocking);
#endif
#if TD_PORT_WINDOWS
Status set_native_socket_is_blocking(SOCKET fd, bool is_blocking);
#endif
} // namespace detail
} // namespace td